/*
 * File      : dfs_net.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2015-2016, RT-Thread Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2015-02-17     Bernard      First version
 * 2016-05-07     Bernard      Rename dfs_lwip to dfs_net
 * 2018-03-09     Bernard      Fix the last data issue in poll.
 */

#include <rtthread.h>
#include <dfs.h>
#include <dfs_fs.h>
#include <dfs_file.h>
#include <dfs_posix.h>

#include <rtdevice.h>
#include <sys/socket.h>

#include <dfs_poll.h>
#include "dfs_net.h"

int dfs_net_getsocket(int fd)
{
	int sock;
	struct dfs_fd* _dfs_fd;

	_dfs_fd = fd_get(fd);

	if(_dfs_fd == NULL) return -1;

	if(_dfs_fd->type != FT_SOCKET) sock = -1;
	else sock = (int)_dfs_fd->data;

	fd_put(_dfs_fd); /* put this dfs fd */
	return sock;
}

static int dfs_net_ioctl(struct dfs_fd* file, int cmd, void* args)
{
	return -EIO;
}

static int dfs_net_read(struct dfs_fd* file, void* buf, size_t count)
{
	int sock;

	sock = (int)file->data;
	count = lwip_read(sock, buf, count);

	return count;
}

static int dfs_net_write(struct dfs_fd* file, const void* buf, size_t count)
{
	int sock;

	sock = (int)file->data;
	count = lwip_write(sock, buf, count);

	return count;
}

static int dfs_net_close(struct dfs_fd* file)
{
	int sock;
	int result;

	sock = (int)file->data;
	result = lwip_close(sock);

	if(result == 0) return RT_EOK;

	return -result;
}

static int dfs_net_poll(struct dfs_fd* file, struct rt_pollreq* req)
{
	int sfd;
	int mask = 0;
	struct lwip_sock* sock;

	sfd = (int)file->data;

	sock =  lwip_tryget_socket(sfd);

	if(sock != NULL) {
		rt_base_t level;

		rt_poll_add(&sock->wait_head, req);

		level = rt_hw_interrupt_disable();

		if(sock->lastdata || sock->rcvevent) {
			mask |= POLLIN;
		}

		if(sock->sendevent) {
			mask |= POLLOUT;
		}

		if(sock->errevent) {
			mask |= POLLERR;
		}

		rt_hw_interrupt_enable(level);
	}

	return mask;
}

const struct dfs_file_ops _net_fops = {
	NULL,    /* open     */
	dfs_net_close,
	dfs_net_ioctl,
	dfs_net_read,
	dfs_net_write,
	NULL,
	NULL,    /* lseek    */
	NULL,    /* getdents */
	dfs_net_poll,
};

const struct dfs_file_ops* dfs_net_get_fops(void)
{
	return &_net_fops;
}

